HAZMAT
Alert! That white
powder (sometimes colored powder or corn starch) on the ground or pavement isprobably NOT an anthrax attack. Although everyone must be on alert
nowadays, there is a high probability that what appears to
be handfuls of white bread flour (including markings with circles, X's
or arrows), is part of a trail
left by one of the many hundreds of Hash House
Harriers and Hounds jogging groups in America or
overseas.

Check the local
Hash trail schedule for your area at one of the
links above (or below for Georgia). If they were
laying a trail within a couple of miles of your
mysterious white powder, then it's probably
flour.